border-1px($color)
	position relative
	&:after
		content ''
		display block
		position absolute
		left 0px
		bottom 0px
		width 100%
		border-top 1px solid $color

bg-img($url)
	background-image url($url + "@2x.png")
	@media (-webkit-min-device-pixel-ratio: 3), (min-device-pixel-ratio: 3)
		background-image url($url + "@3x.png")

